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Date: Mon, 12 Oct 2009 14:06:46 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Greg KH <gregkh@suse.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [crash] NULL pointer dereference at IP: [<ffffffff812e9ccb>]
 uart_close+0x2a/0x1e4
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> BUG: unable to handle kernel NULL pointer dereference at 0000000000000240
> IP: [<ffffffff812ea215>] uart_close+0x24/0x1e5

Very odd indeed. Can you dump the value of

	state (ie tty->driver_data)

	and if state is non NULL

	state->uart_port

in the crash case

and if state->uart_port is NULL then there is some head scratching
required 
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